2020 · Q17
If x² + 9y² = 6xy, then what is y : x equal to?
Elementary MathematicsAlgebra
- A1 : 3
- B1 : 2
- C2 : 1
- D3 : 1
Explanation
x² + 9y² = 6xy rearranges to x² − 6xy + 9y² = 0, i.e. (x − 3y)² = 0. Hence x = 3y, so the ratio y : x = 1 : 3.
If x² + 9y² = 6xy, then what is y : x equal to?
Explanation
x² + 9y² = 6xy rearranges to x² − 6xy + 9y² = 0, i.e. (x − 3y)² = 0. Hence x = 3y, so the ratio y : x = 1 : 3.